As described in this tutorial, aiming lights can be easier if you can see “through” the light using a camera duct-taped on to it. Commonly found in 3D apps, the light-view option is sadly lacking in After Effects. Well here’s a script to do the duct-taping for you.
What it does is create a camera with the same point of interest, position, and zoom (≈cone angle) as the light, then makes the camera the parent of the light. You can then use the camera tools in AE to aim the new camera, and the light will follow. Just remember to de-activate it before rendering.